Sold my M8 long ago and still have some of the Leica UV/IR filters hanging around:
All are LNIB. Always interested in reasonable offers.
Also have a beautiful Heliopan 86mm SH-PMC Slim Polarizer. My new 35mm Summarit-Asph S lens is 82mm and using a step-up ring precludes using the hood, so this polarizer has to go. Asking $175.